He's going to be ok. Kids at that age are tough and heal quickly. My oldest son had brain surgery at ten yo. He's still a pia at 45 yo. Lol I know the feeling all we can do is hope and pray.
Prayers for Gunner and your whole family.
It's heartbreaking to watch little ones subjected to pain, but I sometimes think God blesses them with incredible fortitude for how well they often manage.
My prayers for Gunner for speedy healing through his terrible issues. Thank the Lord that medicine has progressed to be able to correct these problems. He's young and resilient and most of this will hopefully be just a dim memory to him later in life.
Not so for you and his family so you're in my prayers also.
Hard prayers up for your grandson Bob. Childhood should be a time for learning and playing and growing without having to worry about health or security issues. We all get enough of that in our adult lives.
My prayer also include you and the family. Y'all will be there for him for the duration. God bless....